Kyrie

"Nero, you're you and it's you I want to be with. I don't know anyone that is human as you are." -Kyrie

Kyrie is a supporting character in Devil May Cry 4. She was born and raised in Fortuna, is the sister of the leader of the Order of the Sword's Holy Knights, Credo and songstress for their festival called the Festival of the Sword. Kyrie is the childhood friend of Nero, and his lover. Kyrie also carries a necklace with her that was given to her by Nero at the beginning of the game as a present during the festival. The love between Kyrie and Nero seems to be started before the start of the events of Devil May Cry 4, but their love is used as a major plot point during the game and used in many different times.

Background
The Kyrie eleison ("Lord have mercy" in Greek) is the first part of the Catholic Ordinary of the Mass. It is traditionally sung in Greek.